Hot-blast stove



3 Sheets-Sheet l.

(No Model.)

H. KENNEDY.

HUT BLAST STOVB. No. 398,970. Yl'emzemtel 5 1889n (No Model.) 3 sheets-s116612 2. H. KENNEDY.

HOT BLAST STOVE.

'Patented Mam. 5.71889.

N. PETERS. Phaxo-Lnhogmpher. wuhngium D. C.

(No Model.) 3 ShetS-Sheet 3.

H. KENNEDY.

HUT BLAST STOVE.

No. 398,970. Patented Mar. 5, 1889.v

er. waningmn. D.,C.

WIHESEEET Unirse States arent @ee-ice..

liUGll KENNEDY', OF SIARPSBVRG, PENSYLVANIA.

HOT-BLAST STOVE.

SPECIFCATION forming part of Letters Patent No. 398,970, dated March 5, 1889.

Application filed August l5, 1887, Serial No. 246,933. (No modeld T 11.7K '1f/'71mm it may concer/Lf: have verticai walls projecting.;` trom their inlc it known that l, HUGH. KENNEDY, of nersurt'ace, orbe providedwith checker-work 5 5 Sharpshurg, in the county ol' Alleghen)v and or hollow bricks. In the latter two instances State of lkuinsjvlvania, have invented a new the tillino' should be supported hy suitable and useful. Improvement in llot-l'last Stoves; arches in the usual wa.)T to an open chamber and I do hereby declare the following to be a at the bottom. These instances of varia-tion ifull, clear, and exact description thereof. are mere statements as to how the heating- 6c )ly invention rela-tes to fire-brick hot-blast surface in the interior ot' the stove maybe instoves; and its object is to cheapen and simcreased, if desired, and not given with aview io plii'y their construction, to reduce the eizof claiming such construction or of limiting pense ot maintenance, and to save manual my inventiouto the use ot' any particular conlabor in ltheir operation. struction or arrangement oi the heating-sm- 6D The etl'orts ot constructors and improvers 'f aces, as any goed and adequate construction of hot-blast stoves have been largely directed ot the same will do. rlhe air-inlet S is placed to economyv in gas, the theory being that all at one end of the row of stoves, and the hotthe heat possible should be extracted from air outlet 9 at the other end. There is asepa.- the gas betore it escaped to the stack-flue. rate gas-inlet, lO, at or near the base of each 7o T his has led to the devisingand construction stove and a separate gas-outlet, il, at the top ot stoves so expensive to erect and maintain ot' each stove. The stoves communicate with 2o that the advantage arising from their econcach other by opening-sthrough the partition omy in gas is nearly, itl not quite, overbalwalls. anced thereby. M v practical experience in It is necessary that there should be at least 75 blast-furnace practice has been that most of two stoves, although as many more as maybe the modern blast-furiuices produce more gas desired'may be connected therewith, and the than is necessary for heating thc blast, and air-exit of each should be at the opposite end that the excess allowed to go to waste. lt trom. the air-inlet. 'lhus in Fig. l the air-intherefore unnecessary that the stoves of let 8 ot the stove 'i is at the base and the air- So such furnaces should be constructed with speoutlet is the opening' if, b v which. the stove l. cial reference to economei7 ot' gas, and the concolnmunicates with the stove 2, and in like 3o sequence is that cheaper stoves, it' capable manner thc outlet of the stove 2 is at the botot heating` the air properly, will do just as tom, being the opening, lf3, by which it coinwcll as those at present used. municates with the stove 2S, and the outlet 8:, The object ot' my .invention is the producof the stove 3 at the top, beingl the opening tion of a cheap and effectiveblast-heatingapli, bhv which it communicates with the stove 5 para-tus. 4. The air entering,` at the inlet 8 passes al- To enable others skilled in the art to make tcrnately up and down, and ai'ter traversing and use my invention, l will now describe the entire length of each stove passes out at oo it by reference tothe accompanving` drawings, the outlet f), which, it will be understood, is in whichconnected with the hot-air liuc leading to the .to lfigure l is a vertical longitudinal section furnace. The inlet-S is provided withavalve, of a plant ot fou r stoves embodying my inl5, and the outlet D with a valve, lf3, so that vention on the line A A of Fig. Fig. 2 is a they can be closed when the stoves are put 95 horizontal section on the line l Vot Fig. i. on gas. The gas enters cach stove at the Fig. is a vertical cross-section on the line C gas-inlet l() near the bottom and passes di- (l ot' Fig'. 2, showing the stoves on gas. Fig. rectly up through the stove and out through t is a similar section showing' the stoves on the gas-outletli at the top ot the same. The

air. gas is supplied through the usual gas-tine, 33, 10o

Like igures ot reference indicate like parts Figs. 3 and l, whence it passes into the stove wherever they occur. by means of a pipe, 1T, leading [from the flue 5o The stoves, ot which a plant of i'ouris shown up to the gas-inlet opening i0. This pipev in Figs. i. and i?, are constructed of tire-brick 17 may, if desired, be fixed; but I prefer the and have the usual externa-l sheet-iron easing, construction shown, iu which the upper part,

' o. 'l hey ma)v be empty chambers, as a-tl, or l 1S, of this pipe is movable, being secured io a slide, 19, which rests on a bed-plate, 20, and is reciprocated by means of a rack, 21, and pinion 22. By this construction the horizontal end of the pipe 18 can be moved forward into the gas-inlet IO or drawn backward out of it. Vhen it is moved forward, its lower end registers with the upper end of t-he stationary part of the pipe 17 and communication is established between the gas-flue 33 and the Stove, as shown in Fig. 3, and when the slide 1.() is drawn back the pipe 1S is retracted from the gas-inlet and the solid part of the slide covers the upper opening of the pipe 17, thereby acting as a valve to close the same. The gas-inlet l0 is then closed by a door, 23, as shown in Fig. 4, which when the inlet is opened is either removed or suspended above the inlet, as shown in Fig. Air for the combustion of the gas is admitted by an annular opening formed'aro und the gas-pipe 18 by making such pipe of smaller diameter than that of the gas-inlet 10, as shown in Figs. I, 2, and 3, The gas-outlet l1 is controlled by a sliding door or valve, 24, which moves laterally across the top of the outlet in guides or ways 25, being operated by a shaft, 26, by means of a pinion, 27, mounted on the shaft engaging with a rack, 28, attached to the slide 24, (See Figs. 2, 3, and 4.) The shaft 26 extends along the top side of the stoves, and by means of the construction named operates all of the top valves of the group of stoves. It is provided at one end or any other convenient place with a pulley, 29, from which a suitable chain or belt, 30, extends to =the pulley 3l, mounted on a shaft and operated by a windlass, 32, near the ground, or by other suitable power applianee.

Then it is desired to take the stove off gas, the connection-pipes 1S are withdrawn, the gas-inlets 10 closed, and then the sliding valves 24 at the tops of the stoves are closed. If it is desirable to protect the bed-plate and guides 25 of the valve 24 from the heat of the escaping gases, it can be done by the use of a short pipe or tube, 34, Figs. I, 3, and 4, which is pivotally connected to the outer end of the guide-plate 25 by rods 35, one on each side, which in turn are pivotally connected to the pipe at a suitable point above the guide-plate, and by pivotally connecting the pipe by means of longer rods, 3G, one on each side, to the valve 24, the said rods 3G being also pivotally connected to the valve. lVhen thus connected the pipe 34 occupies a vertical position over the gas-outlet 1l when the valve 24 is open, the lower end of the pipe extending down inside of the guide-plate 25 and resting upon the top of the stove; but when the valve 24 is closed the rods 36 push it up out of its seat and cause it to turn on the rods 35, so that it is not only raised out of its seat, but moved backward and deposited on the top of the stove out of the way of the valve, thereby permitting the latter to come to its seat over the gas-outlet 11, as illustrated in Fig. 4. The pipe 234 thus acts as a chimney to the stove. I do not, however, limit myself to the slide-valve 24, as it is evident that I can close the gas-outlet l1 by other well-known means-such, for

instance, as the ordinary damper. This is a detail of construction which may be modiiied in various ways by the skilled furnacebuilder.

These stoves must each have a direct passage for the gas from the gas-inlet to the gas-outlet, while the air traverses the entire series, entering at or near one end of one stove and passing thence to the next stove at or near the other end, and so on, traversing every stove of the series, whether there be two, three, or more, before it passes out at the exit.

I do not herein claim the within-described construction of detachable connections between the gas-tine 33 and the stoves, nor indeed any other feature of construction not specifically set forth in the following claims.

That I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination of a series of hot-blast stoves, connected by alternate high and low openings, forming a continuous air-passage therethrough, with separate gas-inlets at the base and separate gas-outlets at the top of each stove, substantially as and for the purposes described.

2. The combination, in a hot-blast stove, of a gas-outlet at the top, with a sliding valve for closing the saine, and a pipe pivotally connected by rods to the sliding valve, and also pivotally connectedby rods to a stationary point on the opposite side from the valve, so that when the valve is opened t-he pipe shall occupy a vertical position over the gasoutlet, and when the valve is being advanced to close the outlet the pipe shall be raised out of the path of the valve, substantially as and for the purposes described.

3. The combination, with a row or series of hot-blast stoves, each having a gas-,outlet IOO IIO

at the top controlled by a sliding valve proi vided with a rack, of a power-shaft extending transversely to the valves and provided with pinions engaging the racks, a pulley on said shaft, and a chain or belt extending to near the ground for actuating the shaft, substantially as and for the purposes described.

4. A series of hot-blast stoves having airports opening from one to the other, each stove of the series being provided with a gas inlet and outlet port, so that the gas shall pass through each stove independently of the other, and the air shall pass from one stove to the other, substantially as and for the purpose specified.

In testimony whereof I have hereunto set my hand this 6th day of August, A. I). 1887.

I'IUGII KENNEDY.

XVitnesses:

J. K, SMHH, THOMAS W. BAKEWELL. 

